\
The expression is
.
\
To subtract
–6.4 means add 6.4.
\
\
(Add:
)
\
The value of the expression is
– 13.
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=a01e556b086336aacd80df183bfb8c00.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=084e7250d3fe59b5b2bf06d6576b13dd.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=769899c1c9eb0262dc7bcf5c25ac0eac.png\")
(Add: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=358597d8581d48c6f11bae08f917cab4.png\")
)![\"\"](\"/userfiles/image/steps_images/solution.JPG\")